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吉林省延吉盆地白垩系未熟油目前主要见于德新凹陷大拉子组，埋深小于１０００ｍ，与同盆地的成熟油相比，芳烃和沥青质含量相似，而饱和烃含量低、非烃含量高，组分碳同位素轻（小于－３０‰），Ｃ２９２０Ｓ／（２０Ｓ＋２０Ｒ）值小于０．３５，Ｃ２９ββ／（ββ＋αα）值小于０．２５，烃转化率相近或略低。认为该盆地未熟油生成阶段的Ｒｏ值为０．３％～０．６％。建立了未熟油的生油模式。根据油源对比，德新凹陷未熟油主要来源于大三段和大一段油源岩。从原油γ蜡烷含量推断，未熟油源岩可能形成于咸水—半咸水环境；据原油∑Ｃ２７甾烷／∑Ｃ２９甾烷的值判断，未熟油的湖相生物贡献多于成熟油。盆地的未熟油重点勘探地区应是东部的德新凹陷和清茶馆凹陷。图５表２参４（梁大新摘
The immature Cretaceous oil in the Yanji Basin, Jilin Province, is mainly found in the Dalazi Formation of the Dexin Sag with a buried depth of less than 1000 m. Compared with mature oil in the same basin, the aromatics and asphaltene contents are similar, while the saturated hydrocarbon content is low and the non-hydrocarbon content is high (Less than -30 ‰), the value of C2920S / (20S + 20R) was less than 0.35, the value of C29ββ / (ββ + αα) was less than 0.25 and the hydrocarbon conversion was similar or slightly lower. The Ro value of the uncured oil formation stage in this basin is believed to be between 0.3% and 0.6%. Established a raw oil production mode. According to the comparison of oil source, the immature oil in Dexin depression mainly comes from the third member and the first member of source rocks. Judging from the crude oil γ-wax content, the immature oil source rocks may form in brackish water-brackish water environment. Judging from the value of the crude oil ΣC27 sterane / ΣC29 sterane, the immature oil contributes more than the mature oil . Key areas of immature oil in the basin should be the Dexin depression and the Qingcha depression in the east. Figure 5 Table 2 Reference 4 (Liang Daxin Abstract